The fan in every laptop is very important to the remove excess heat. The fan creates an airflow which causes particles such as fibers, hair and dust to get drawn up through the machine, many of these particles pass right through without issue. Over time air flow gets blocked by dust, hair, etc to the point that the fan no longer is able to spin. This leads to laptops over heating repair, which in turn can do all kinds of damage such as kill motherboard, hard drive, video chip, processor, wireless cards, and any other part inside the laptop.
First sign of over heating issue is computer starts to shut down randomly. The bottom of the laptop can become uncomfortable to touch.
You may notice that your fan is spinning much more often and for much longer or become noisy.
How long will the repair take?
Overheating repair depends of how severe the problem is but usually it takes few hours for cooling system cleanup.